Housekeeping · Central HVAC care

Check HVAC filter size, MERV and replacement timing

Choose the correct filter dimensions and supported efficiency, then follow replacement guidance.

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A central HVAC filter is not the same as a portable air-purifier filter. US EPA guidance stresses correct dimensions, filter fit, and an efficiency level the system can handle. Have a professional service inaccessible equipment.

Your try-it-at-home checklist

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Distinguish a central HVAC system from a wall-mounted or window air conditioner.
Read the manual for the exact filter size and cleaning or replacement instructions.
Match the filter's width, height and thickness; do not crush a filter to fit.
Higher MERV ratings can capture more fine particles, but only choose an efficiency supported by the equipment.
Shut down equipment as instructed and replace only a user-accessible filter. Never open sealed equipment.
Record the replacement date and consult a professional if unusually heavy soiling or airflow problems recur.

Your try-it-at-home checklist

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